JP5322959B2 - Barrier device and photographing device - Google Patents

Description

  The present invention relates to a barrier device provided in front of a photographing optical system for protecting a photographing lens, and a photographing device having the barrier device.

  In general, a photographing apparatus such as a digital camera includes a barrier device on the front surface of the photographing lens barrel in order to protect the photographing lens from dust entering from the outside. This type of barrier device is disclosed in Patent Document 1, for example.

  The barrier device for a photographing lens barrel described in Patent Document 1 includes a pair of barrier blades that open and close a photographing opening in front of a photographing optical system, and the barrier blades rotate around an optical axis. It is opened and closed by a ring. When closing the barrier, the rotating barrel of the taking lens barrel is rotated clockwise. The rotational force of the rotating cylinder is transmitted to the barrier drive ring via the connecting shaft, and the barrier drive ring rotates clockwise while charging the barrier opening spring. At this time, the barrier blade is pushed by the barrier drive ring and rotates counterclockwise, and the barrier blade is closed to cover the photographing opening in front of the photographing optical system.

  On the other hand, when opening the barrier, the rotating cylinder is rotated counterclockwise, and the barrier drive ring is rotated counterclockwise. As a result, the pressure of the barrier driving ring against the barrier is released, and the barrier blade is rotated clockwise by the spring force of the charged barrier opening spring. The front shooting opening opens.

  In recent years, a demand for a wide lens having a large effective optical path diameter has increased, and an apparatus using a pair of barrier blades as described in the above publication requires a barrier blade having a large area. However, when the area of the barrier blade is increased, the diameter of the taking lens barrel is increased in order to secure a retreat place when the barrier is opened.

  Therefore, a method of increasing the number of barrier blades has been devised instead of increasing the area of each barrier blade. For example, the barrier device of Patent Document 2 forms a pair with a barrier blade group composed of three barrier blades rotatably held on one support shaft, and similarly three barrier blades. And a barrier blade group.

  Each barrier blade group includes two springs and one drive lever. The first spring biases the barrier blade in the closing direction, and the second spring acts with a stronger elastic force than the first spring to bias the barrier blade in the opening direction. Further, the driving lever interrupts the action of the elastic force of the second spring on the barrier blades when driven by an external force. When opening the barrier, no external force is applied to the drive lever. As a result, the force of the first and second springs acts on the barrier blade, but the barrier opens because the elastic force of the second spring is strong. When closing the barrier, an external force is applied to the drive lever so that the elastic force of the second spring is not transmitted to the barrier blade. Thereby, the barrier blade is closed by the elastic force of the first spring.

Japanese Patent Laid-Open No. 7-159856 JP 2007-102086 A

  However, in the barrier device of Patent Document 2, since one drive lever and two springs are required for each barrier blade group, the number of parts increases and a space for that is also required.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a barrier device and a photographing device that can be configured to be simple and thin without increasing the outer diameter of the photographing lens barrel even when the front opening of the photographing lens is large. And

In order to achieve the above object, the barrier device according to claim 1 is provided on the object side of the photographing optical system and covers the opening of the photographing optical system so as to be openable and closable. and openable pair of main blade members, and the secondary blade member pairs that are driven to open and close conjunction with the respective opening and closing operation of the pair of main blade member causes rotation to open and close the pair of main blade member and the barrier driving member, is interposed between each of the pair of main blade member and the barrier driving member, attracted and said pair of main blade member and the barrier driving member to each other, the pair of main blade members are closed and a pair of barrier driving spring biases, during the closing operation, and the barrier driving member is rotated in a direction in which the charge amount of the barrier drive spring is increased by an external force, through the barrier drive spring The pair of main blade members are closed and the external force is released during the opening operation, and the barrier drive spring is rotated by the force of the barrier drive spring so that the charge amount of the barrier drive spring is reduced. Directly transmitting to the pair of main blade members to open the pair of main blade members .

In order to achieve the above object, an imaging apparatus according to a fifth aspect includes the barrier device.

  According to the present invention, the barrier device can be configured to be simple and thin without increasing the outer diameter of the taking lens barrel even when the front opening of the imaging optical system is large.

It is an exploded perspective view of the barrier device concerning an embodiment of the invention. It is a front view in the closed state of the barrier device concerning an embodiment. It is a front view in the closed state which shows the inside of the barrier apparatus which concerns on embodiment. It is a front view in the open state which shows the inside of the barrier apparatus which concerns on embodiment. It is sectional drawing of the barrier apparatus which concerns on embodiment. 1 is an external perspective view of a digital camera that is an example of an imaging apparatus according to an embodiment of the present invention. 1 is an external perspective view of a digital camera according to an embodiment. It is a block diagram which shows the electrical structure of the digital camera which concerns on embodiment. 4 is a flowchart showing processing from power-on of the digital camera according to the embodiment to the end of shooting.

  Hereinafter, embodiments of the barrier device and the imaging device of the present invention will be described with reference to the drawings.

  First, the structure of a barrier device that operates in conjunction with a photographing lens barrel provided in a digital camera that is an example of a photographing apparatus according to the present invention will be described with reference to FIGS.

  1 to 5 are views showing the structure of a barrier device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of the barrier device, FIG. 2 is a front view of the barrier device in a closed state, and FIG. FIG. 4 is a front view of the barrier device in the closed state, FIG. 4 is a front view of the barrier device in the open state, and FIG. 5 is a cross-sectional view of the barrier device.

  As shown in FIG. 1, a photographing lens 1 that is a photographing optical system installed in a photographing lens barrel 100 is held at the outer periphery by a photographing lens holding member 10 and is provided at the center of the base member 2. It is inserted into the lens holding portion 2b having an opening shape. Here, the photographing lens holding member 10 for holding the photographing optical system is bonded and fixed to the base member 2 on which the barrier device is held at the rear portion of the lens holding portion 2b shown in FIG. In the present embodiment, in the optical axis direction of the photographing lens 1, the subject side (the lower left direction in FIG. 1, the upper direction in FIG. 5) is the front side, and the camera side (the upper right direction in FIG. 1, the lower direction in FIG. 5). It is defined as backward.

  A barrier device 200 including at least six blade members 4, 6, 7 that covers the opening of the photographing optical system so as to be openable and closable is held in front of the photographing lens 1 incorporated in the base member 2. In addition, a lens holding portion 2 b that holds the photographing lens 1 is disposed on the base member 2 that holds the barrier device 200. As shown in FIG. 5, the lens holding portion 2 b is formed in a tapered shape, and holds the photographing lens holding member 10 in combination with a tapered portion formed on the outer periphery of the photographing lens holding member 10.

  Hereinafter, the structure of the barrier device 200 will be described in detail.

  The barrier device 200 according to the present embodiment is rotationally driven around the optical axis of the photographing lens 1 in order to open and close the blade members 4, 6, and 7 that are examples of barrier blade means provided in front of the photographing lens. A barrier driving member 3 is provided. An opening is formed at the center of the barrier driving member 3 so as to avoid the photographing lens 1. And in front of the barrier drive member 3, a pair of main blade members 4 that can be opened and closed provided facing each other at the opening, and a plurality of pairs (two pairs in this example) corresponding to each main blade member 4 respectively. The sub blade members, that is, the first sub blade member 6 and the second sub blade member 7 are sequentially arranged so as to overlap each other.

  Then, the barrier driving member 3 is set with respect to the base member 2 and rotated, so that the barrier driving member 3 is held so as not to be engaged with the base member 2 and come out. The barrier driving member 3 is provided with a rotating sliding portion 3c (see FIG. 5) that serves as a reference for the operation of the barrier driving member 3. A rotation sliding portion 3c, which is the rotation center of the barrier driving member 3, is provided in the vicinity of the photographing lens 1 and is disposed in front of the lens holding portion 2b. With such an arrangement, the rotary sliding portion 3c is arranged at a position that overlaps the lens holding portion 2b with respect to the direction perpendicular to the optical axis and is displaced in the optical axis direction. An increase in the diameter of the lens barrel can be prevented.

  The main blade member 4 is disposed on the barrier driving member 3 so as to be in contact therewith. The two main blade members 4 are configured to open and close on the same plane substantially orthogonal to the optical axis of the photographing lens 1, and the four first and second sub blade members 6 and 7 are the main blade member 4. It rotates around the rotary shaft member 4b provided above. That is, the two main blade members 4 are driven by the rotation of the barrier driving member 3, and the first and second sub blade members 6 and 7 are driven in conjunction with the operation of the main blade member 4.

  An axial main blade rotating column 4 a formed in the pair of main blade members 4 is inserted into a barrier rotating hole 2 a provided in the base member 2. The barrier driven member 4 d provided on the main blade member 4 can be in contact with the barrier interlocking portion 3 b provided on the barrier driving member 3.

  Between the pair of main blade members 4 and the spring holding member 3a provided in the barrier driving member 3, the main blade member 4 and the barrier driving member 3 are attracted to each other to urge the main blade member 4 in the closing direction. Drive springs 5 are respectively interposed.

  In addition, a rotation shaft member 4b is provided directly behind the main blade rotation column 4a of the main blade member 4, and the first sub blade member 6 and the second sub blade member 7 are installed on the rotation shaft member 4b so as to sequentially overlap. Has been. That is, the rotating shaft member 4 b is inserted into the first shaft hole 6 c provided in the first sub blade member 6 and the second shaft hole 7 a provided in the second sub blade member 7.

  In addition, a barrier cover member 8 that holds the barrier device is provided in front of the first and second sub blade members 6 and 7, and the rotary shaft member 4 b is a shaft hole 8 a provided in the barrier cover member 8. Has been inserted. The barrier cover member 8 is fixed to the base member 2, and the barrier cap member 9 is mounted thereon.

  Thus, the rotating shaft member 4b is inserted into the shaft hole 8a provided in the barrier cover member 8, and is mutually overlapped in the optical axis direction. Therefore, even if the first and second sub blade members 6 and 7 are tilted or twisted by some operation, the rotation shaft member 4b is prevented from falling off. In addition, the shaft hole 8a is finally covered with the barrier cap member 9 so that it cannot be seen from the outside.

  When the barrier device is closed, the barrier driving member 3 is rotated counterclockwise about the optical axis in FIG. 3 and FIG. 4 (the barrier driving spring 5 is moved by an external force from a driving device (not shown) in the photographing lens barrel 100. The main blade member 4 rotates in the clockwise direction around the main blade rotating column 4a via the barrier drive spring 5. The first sub blade closing interlocking portion 4c provided at the tip of the main blade member 4 interlocks the first sub blade closing interlocking portion 6b provided at the tip of the first sub blade member 6 in the barrier closing direction. The second sub blade closing interlocking portion 6d provided in the first sub blade member 6 interlocks the second sub blade closing interlocking portion 7b provided in the second sub blade member 7 in the barrier closing direction. In this way, the rotational force is transmitted to the blade members 4, 6, and 7 in order, and the barrier device 200 is closed.

  Even if only the blade members 4, 6, 7 are forcibly opened while the barrier device 200 is closed, the blade members 4, 6, 7 are automatically urged in the closing direction by the spring force of the barrier drive spring 5. . That is, when the barrier drive member 3 is set to the closed position and the blade members 4, 6 and 7 are opened, the charge amount of the barrier drive spring 5 gradually increases according to the opening operation.

  On the other hand, when the barrier device 200 is opened, the barrier driving member 3 is released from the external force and rotates clockwise (the direction in which the amount of charge of the barrier driving spring decreases) in accordance with the balance of the spring force of the barrier driving spring 5. The barrier interlocking portion 3b of the barrier driving member 3 contacts the barrier driven member 4d provided in the main blade member 4, and rotates the main blade member 4 counterclockwise. The first sub blade opening interlocking portion 6 a provided on the first sub blade member 6 is pushed open by the side surface of the main blade member 4, and the second sub blade member 7 is provided on the second sub blade member 7 by the side surface of the first sub blade member 6. The blade opening interlocking portion 7c is pushed open. As a result, the blade members 4, 6, and 7 are opened. At this time, the second sub blade opening interlocking portion 7c comes into contact with the base member 2 and becomes a mechanical stopper.

  During the closing operation of the barrier device 200, the barrier driving member 3 moves to the closed position so that the blade members 4, 6, and 7 close the photographing opening. Then, as the barrier drive member 3 moves from the closed position to the open position and the blade members 4, 6, 7 open, the charge amount of the barrier drive spring 5 gradually decreases. In addition, when the blade members 4, 6, and 7 are pressed with fingers and the barrier driving member 3 is moved to the closed position, the amount of charge of the spring force of the barrier driving spring 5 gradually increases according to the movement. .

  Thus, the opening / closing operation of the main blade member 4 causes the first sub blade member 6 disposed immediately above the main blade member 4 to perform the opening / closing operation in conjunction with each other. Further, the second sub blade member 7 disposed immediately above the first sub blade member 6 performs an opening / closing operation in conjunction with the opening / closing operation of the first sub blade member 6.

  In the present embodiment, the main blade member 4 is made of resin, and the first and second sub blade members 6 and 7 are made of metal. In this way, the thickness from the photographing lens 1 to the front surface of the barrier cover member 8 can be minimized, and the camera can be thinned. The first and second sub blade members 6 and 7 can be made of resin.

  According to the present embodiment, since the barrier device that covers the front surface of the photographing lens when not in use is configured as described above, the number of parts can be simplified compared to the conventional case, and the front surface of the photographing lens 1 can be simplified. Even if the aperture is large, the outer diameter of the taking lens barrel can be reduced. Furthermore, a barrier device having a small thickness can be realized. Hereinafter, the advantages of the barrier device according to the present embodiment will be described in more detail.

  (1) As described above, the barrier device according to the present embodiment has at least six blade members 4, 6, and 7, and the main blade member 4 directly installed on the barrier driving member 3 has a base The base member 2 is fitted with a shaft. On the main blade member 4, a shaft 4 b serving as the rotation center of the sub blade members 6 and 7 is provided, and a spring 5 is installed between the barrier driving member 3 and the main blade member 4 so as to attract each other. When the barrier device 200 is closed, the barrier driving member 3 is rotated counterclockwise by an external force, and the blade members 4, 6, 7 are closed via the spring 5. During the opening operation of the barrier device 200, the external force is released, the barrier driving member 3 is rotated clockwise by the force of the spring 5, and this rotational force is directly transmitted to the blade member 4 to open the blade members 4, 6, and 7. Thereby, even when the opening of the front surface of the photographic lens 1 is large, the barrier device can be simply configured without increasing the outer diameter of the photographic lens barrel 100 and without adding a spring or the like in addition to the spring 5. Can do.

  (2) The barrier cover member 8 is disposed in front of the optical axis of the sub blade members 6 and 7 of the barrier device 200 in the present embodiment, and the rotation axis of the main blade member 4 is a hole (shaft hole 8a) of the barrier cover member 8. ) Is inserted through. As a result, it is possible to prevent the sub blade members 6 and 7 from falling off the rotating shaft and to constitute a stable barrier device.

  (3) Since the rotation sliding portion 3c of the barrier driving member 3 overlaps with the lens holding portion 2b with respect to the optical axis orthogonal direction and is provided at a position shifted in the optical axis direction, the outer diameter of the photographing lens barrel 100 The barrier device can be configured without increasing the size.

  (4) The first sub blade member 6 operates in conjunction with the opening / closing operation of the main blade member 4, and the second sub blade member 7 operates in conjunction with the operation of the first sub blade member 6. A stable barrier device can be configured by operating the barrier device.

  Next, the configuration of a digital camera equipped with the photographing lens barrel 100 including the barrier device 200 according to the present embodiment described above will be described with reference to FIGS.

  6 and 7 are external perspective views of the digital camera according to the present embodiment. FIG. 6 shows a state where the power is turned off, and FIG. 7 shows a state where the power is turned on.

  As shown in FIGS. 6 and 7, the front of the digital camera 12 according to the present embodiment has an auxiliary light projector 16 that emits auxiliary light for autofocusing when necessary, and a composition of the subject. A finder 17, a strobe 18, and a photographic lens barrel 100 are provided. A release button 13, a zoom lever 14, and a power button 15 are arranged on the upper surface of the camera. Although not shown, operation buttons for switching functions are arranged on the back of the camera, and a display made of an LCD, a viewfinder eyepiece, and the like are arranged.

  FIG. 8 is a block diagram showing an electrical configuration of a main part of the digital camera according to the present embodiment.

  The control unit of the digital camera 12 includes a CPU 46, a ROM 45, and a RAM 47. Various components such as a release button 13, operation buttons 21 to 26, a display 20, a memory 40, and a memory card drive 42 are provided via a bus 44. It is connected. The drive circuit 43 connected to the control system via the bus 44 includes a zoom motor drive unit 29, a focus motor drive unit 31, a shutter drive unit 32, an aperture drive unit 35, an image sensor 37 such as a CCD or a CMOS, and a strobe 18. Is connected. Each drive is controlled by a signal from the CPU 46.

  The ROM 45 stores a program for controlling each functional component described above. The RAM 47 stores data necessary for each control program.

  As described above, the digital camera 12 is configured, but when the user turns on the power by operating the power switch button 15, the CPU 46 reads the necessary control program from the ROM 45 and starts the initial operation. To do. That is, the photographing lens barrel 100 is moved to a predetermined photographable region, the photographing function is activated, and the camera is brought into a photographing standby state.

  When the release button 13 is pressed to take a picture, the brightness of the subject is detected by the image sensor 37, and based on the photometric value, it is determined whether the aperture value, shutter speed, and strobe 18 are to be emitted. Next, the focus member 30 is moved to a predetermined focus position by measuring the distance from the subject and driving the focus motor drive unit 31.

  Next, the shutter 33 is opened and closed, and a desired image is taken into the image sensor 37. The image sensor 37 accumulates a charge corresponding to the amount of incident light based on the exposure control value, and the charge becomes an image signal and is output to the analog signal processing unit 36. The analog signal processing unit 36 performs analog processing on the captured image data and outputs it to the A / D conversion unit 38. The A / D converter 38 converts the captured analog data into digital data. This digital data is output to the digital signal processing unit 39, where the digital data is processed. Finally, the digital data is stored in the memory 40. The image data stored in the memory 40 and the image data stored in the memory card drive 42 can be expanded by the compression / decompression unit 41, and the image data can be displayed on the display 20 via the bus 44.

  Further, by operating the zoom lever 14, the zoom motor drive unit 29 is controlled via the drive circuit 43 so that the photographing lens barrel 100 can be moved in the optical axis direction to change the focal length. Yes.

  Next, a flow from the power-on of the digital camera to the end of shooting will be described with reference to FIG.

  FIG. 9 is a flowchart showing processing from power-on of the digital camera to the end of shooting in the present embodiment.

  First, when the user turns on the power of the digital camera (step S101), the CPU 46 sends a command to the zoom motor drive unit 29 to rotate the zoom motor CW (step S102). Thereafter, a predetermined operation is performed, and when it is confirmed that the photographic lens barrel 100 has moved to the photographing position (step S103), the zoom motor is stopped. At this time, the photographic lens barrel 100 moves from the position of FIG. 6 to the position of FIG.

  Next, when the user turns on the release button 13 (step S104), photometry is performed to obtain the luminance value of the subject (step S105). When the obtained luminance value is higher than a predetermined threshold value (step S106), the stop 34 is inserted into the optical path, and the amount of incident light is reduced (step S107). When the obtained luminance value is lower than the predetermined threshold value (step S106), the diaphragm 34 is not operated, and is kept away from the optical path.

  Thereafter, the focus member 30 is operated and moved to a position where the subject is in focus (step S108), and image capture is started there (step S109). Next, the shutter 33 is actuated to open and close (step S110), and the image capture is completed (step S111). Thereafter, the diaphragm 34 is retracted from the optical path (step S112), the focus member 30 is moved to the initial position, and the operation ends (step S113).

DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Base member 2a Barrier rotation hole 2b Lens holding part 3 Barrier drive member 3a Spring holding member 4 Main blade member 4b Rotating shaft member 4c First sub blade closing interlocking unit 5 Barrier drive spring 6 First sub blade member 6c Axis Hole member 7 Second sub blade member 7a Shaft hole member 8 Barrier cover member 8a Shaft hole member 100 Shooting lens barrel 200 Barrier device

Claims (5)

A barrier device provided on the subject side of the photographing optical system and covering the opening of the photographing optical system so as to be freely opened and closed,
A pair of openable main blade members provided facing each other;
A plurality of pairs of sub-blade members that are driven to open and close in conjunction with the opening and closing operations of the pair of main blade members;
A barrier driving member that rotates to open and close the pair of main blade members;
It is interposed between the barrier drive member and each of the pair of main blade members, pulls the barrier drive member and the pair of main blade members together, and biases the pair of main blade members in the closing direction. A pair of barrier drive springs,
Oite during closing operation, and the barrier driving member by an external force is rotated in the direction in which the charge amount of the barrier drive spring is increased, closing the pair of main blade members via the barrier driving spring, during the opening operation, The external force is released, the barrier drive spring is rotated by the force of the barrier drive spring in a direction in which the charge amount of the barrier drive spring is reduced, and this rotational force is directly transmitted to the pair of main blade members. opening the main blade member features and to Luba rear device. And a barrier cover member that is disposed on the subject side of the plurality of sub blade members and holds the barrier device.
The plurality of sub blade members rotate about a rotation shaft installed in each main blade member, and the rotation shaft is inserted into a shaft hole provided in the barrier cover member. The barrier device according to claim 1. The barrier driving member has a rotational sliding portion that serves as a reference for the operation of the barrier driving member,
The rotary sliding portion, the barrier unit overlap in the direction perpendicular to the optical axis to the lens holding portion for photographing optical system holding provided on the base member to be held, it is arranged at a position shifted in the optical axis direction The barrier device according to claim 1 or 2 . The plurality of sub blade members are each a first sub blade member disposed directly above the pair of main blade members, and a second sub blade member disposed directly above each of the first sub blade members. Consists of
The first sub blade member performs an opening / closing operation in conjunction with the opening / closing operation of the main blade member, and the second sub blade member performs an opening / closing operation in conjunction with the opening / closing operation of the first sub blade member. The barrier device according to any one of claims 1 to 3, wherein the barrier device is characterized in that: An imaging apparatus comprising the barrier device according to any one of claims 1 to 4 .

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